With more than $40 million spent against him in his re-election bid in one of the nastiest races in Ohio in recent history, U.S. Sen Sherrod Brown is calling for campaign finance reform.

Brown will have a news conference call at noon today to urge the passage of legislation that would address the Supreme Court's Citizens United decision, which permitted companies and unions to spend unlimited amounts of federal campaigns. These groups can do so without the same disclosure requirements of individuals who contribute to candidates.

The 16th Congressional District race between U.S. Reps. Jim Renacci and Betty Sutton also saw a huge amount of spending by outside groups, with about $10 million spent as of the most recent reports filed before the election, according to the Center for Responsive Politics.